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- W3098770042 abstract "Abstract A method to quantify the energy transfer among turbulent structures using singular value decomposition (SVD) is presented. We apply the method to numerical turbulence data obtained from a global plasma simulation using the Hasegawa–Wakatani fluid model, in which the Kelvin–Helmholtz instability plays a dominant role. Using the SVD method, the electrostatic potential is decomposed into a background potential deformation, a zonal flow, a coherent mode and an intermittent structure. Thus there are four key structures, as distinct from the three found in conventional theory. The kinetic energy of each structure is evaluated, and the limit cycle among them is obtained. In the limit cycle, an abrupt change of the background is found to be synchronised with the period of the zonal flow. The energy transfer function of each turbulence structure, which is defined on the basis of a vorticity equation, is evaluated. This then provides physical understanding of how the limit cycle is sustained by dynamical changes in the energy transfer among structures over the its period. In addition, it is shown that the abrupt deformation of the background is caused by the non-linear self-coupling of the intermittent structure." @default.
- W3098770042 created "2020-11-23" @default.
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- W3098770042 date "2020-12-08" @default.
- W3098770042 modified "2023-10-18" @default.
- W3098770042 title "Evaluation of abrupt energy transfer among turbulent plasma structures using singular value decomposition" @default.
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- W3098770042 doi "https://doi.org/10.1088/1361-6587/abcb46" @default.
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